<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>React Event Handling</title>
    <script src="https://cdn.bootcss.com/react/16.4.0/umd/react.development.js"></script>
    <script src="https://cdn.bootcss.com/react-dom/16.4.0/umd/react-dom.development.js"></script>
    <script src="https://cdn.bootcss.com/babel-standalone/6.26.0/babel.min.js"></script>
</head>
<body>
<div id="example"></div>
<script type="text/babel">
    class Toggle extends React.Component {
        constructor(props) {
            super(props);
            this.state = {isToggleOn: true};
            this.handleClike = this.handleClike.bind(this);
        }
        handleClike() {
            this.setState(prevState => (
                    {
                        isToggleOn: !prevState.isToggleOn
                    }
                )
            );
        }
        render()
        {
            return (
                <button onClick={this.handleClick}>
                    {this.state.isToggleOn ? 'No' : 'OFF'}
                </button>
            );
        }
    }

    ReactDOM.render(
        <Toggle/>,
        document.getElementById('example')
    );
</script>
</body>
</html>